Chad,
I would completely get rid of them on the elevator and the ailerons. Those are the two control surfaces that you CAN'T afford to lose. You can lose rudder and throttle control and still get the plane back down. I wouldn't even try to locktite them, just get rid of them and use z-bends. If you leave them on the throttle and rudder locktite will help there.

Hope this helps

Ken